Long-term changes on the Bransfield Strait deep water masses: Variability, drivers and connections with the northwestern Weddell Sea

Damini, Brendon Yuri; Kerr, Rodrigo; Dotto, Tiago S.; Mata, Maurício M.

doi:10.1016/j.dsr.2021.103667

Cited by 13 publications

(30 citation statements)

References 77 publications

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“…The region has also stored ∼20-50 μmol kg −1 of anthropogenic carbon around the NAP (Anderson et al, 1991;Lencina-Avila et al, 2018;Pardo et al, 2014), which likely comes from recently ventilated DSW (Kerr, Goyet, et al, 2018). Moreover, some recent studies have also shown the impacts of ENSO or SAM on physical, biological, and biogeochemical parameters in the strait (Avelina et al, 2020;Costa et al, 2020;Damini et al, 2022;Dotto et al, 2016). A recent overview of state-of-the-art of carbonate chemistry and the challenges facing the NAP environments can be viewed in Orselli et al (2022) and references therein.…”

Section: Biogeochemical Aspects Of the Bransfield Straitmentioning

confidence: 99%

“…In addition, the deep basins of the Bransfield Strait are filled with Dense Shelf Water (DSW) advected from the north‐western and southern continental shelf of the Weddell Sea and characterized by high density and low temperatures close to the freezing point of seawater (Figure 1b, Frölicher et al., 2015; Hellmer et al., 2017; Sangrà et al., 2011, 2017). Thus, the DSW considered here does not account for the differentiation between High Salinity Shelf Water and Low Salinity Shelf Water sourced by ocean‐atmosphere‐sea ice interactions in the north‐western continental shelves (e.g., Damini et al., 2022; Dotto et al., 2016) and Ice Shelf Water derived from ocean‐ice shelf processes in the southern continental shelves (Nicholls et al., 2009). The influence of Ice Shelf Water on the composition of DSW in the deep layers of the Bransfield Strait is still a challenge (e.g., Damini et al., 2022; van Caspel et al., 2018; Wang et al., 2022), but an overflow is expected in the vicinity of the Powell Basin into the eastern basin (Gordon et al., 2000; Von Gyldenfeldt et al., 2002).…”

Section: Oceanographic Features Of the Bransfield Straitmentioning

confidence: 99%

“…Thus, the DSW considered here does not account for the differentiation between High Salinity Shelf Water and Low Salinity Shelf Water sourced by ocean‐atmosphere‐sea ice interactions in the north‐western continental shelves (e.g., Damini et al., 2022; Dotto et al., 2016) and Ice Shelf Water derived from ocean‐ice shelf processes in the southern continental shelves (Nicholls et al., 2009). The influence of Ice Shelf Water on the composition of DSW in the deep layers of the Bransfield Strait is still a challenge (e.g., Damini et al., 2022; van Caspel et al., 2018; Wang et al., 2022), but an overflow is expected in the vicinity of the Powell Basin into the eastern basin (Gordon et al., 2000; Von Gyldenfeldt et al., 2002). A larger contribution of DSW in the Bransfield Strait occurs during weaker westerlies, events of SAM− and ENSO+ or joint events of both phases (Ruiz Barlett et al., 2018), which intensify the Weddell Gyre.…”

Section: Oceanographic Features Of the Bransfield Straitmentioning

confidence: 99%

“…A larger contribution of DSW in the Bransfield Strait occurs during weaker westerlies, events of SAM− and ENSO+ or joint events of both phases (Ruiz Barlett et al., 2018), which intensify the Weddell Gyre. An intensification of DSW was identified during the 2010s, representing at least 60% of the water mass structure in the deep layer of the central basin (Damini et al., 2022).…”

Section: Oceanographic Features Of the Bransfield Straitmentioning

confidence: 99%

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Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Santos‐Andrade

Kerr

Orselli

et al. 2023

Global Biogeochemical Cycles

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The Bransfield Strait is a climate change hotspot at the tip of the northern Antarctic Peninsula (NAP). The region is marked by a mixture of relatively warm waters from the Bellingshausen Sea with cold shelf waters from the Weddell Sea. Additionally, its deep central basin (>800 m) preserves seawater properties from the north‐western Weddell Sea continental shelf. This study assessed long‐term changes in carbonate chemistry in the Bransfield Strait and found that the hydrographic setting (i.e., a mixture between modified‐Circumpolar Deep Water with Dense Shelf Water [DSW]) drives temporal variability of carbonate parameters. The western basin has experienced decreases in pH (seawater scale) over the last three decades (1996–2019), varying from −0.003 to −0.017 pH units yr−1, while Ωar decreased from −0.01 to −0.07 yr−1 throughout the water column. The central basin was characterized by a high contribution of DSW with high carbon dioxide (CO2) content and the decomposition of organic matter produced and transported into its deep layer. With lower variability for all carbonate system variables, the eastern basin was likely regulated by internal mixing. Overall, the entire strait is almost reaching a CO2‐saturated condition, highlighting how sensitive subpolar regions are to the effects of human‐induced climate change.

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Section: Biogeochemical Aspects Of the Bransfield Straitmentioning

confidence: 99%

Section: Oceanographic Features Of the Bransfield Straitmentioning

confidence: 99%

Section: Oceanographic Features Of the Bransfield Straitmentioning

confidence: 99%

Section: Oceanographic Features Of the Bransfield Straitmentioning

confidence: 99%

See 2 more Smart Citations

Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Santos‐Andrade

Kerr

Orselli

et al. 2023

Global Biogeochemical Cycles

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“…The basal melt rate of ice shelves in the Bellingshausen Sea also exhibits interannual variability in observations and models that has been linked to variability in sea ice and upper ocean processes (Holland et al, 2010;Padman et al, 2012). Interannual variability in ocean temperature, mixed layer depth and sea ice along the western Antarctic Peninsula shelf has in turn been linked to variability in the Southern Annular Mode and El Niño Southern Oscillation (Martinson et al, 2008;Meredith et al, 2010Meredith et al, , 2017Damini et al, 2022;Wang et al, 2022). Variability may also occur on longer (decadal) timescales, but little is known about the potential mechanisms for such possible low-frequency variabil-ity.…”

Section: Introductionmentioning

confidence: 99%

Weddell Sea control of ocean temperature variability on the western Antarctic Peninsula

Morrison

England

Hogg

et al. 2023

Preprint

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Recent ice loss on the western Antarctic Peninsula has been driven by warming ocean waters on the continental shelf. However, due to the short observational record, our understanding of the dynamics and variability in this region remains poor. High-resolution ocean model simulations show that the temperature variability along the western Antarctic Peninsula is controlled by the rate of dense water formation in the Weddell Sea. Passive tracer advection reveals connectivity between the Weddell Sea and the coastline of the western Antarctic Peninsula and Bellingshausen Sea. During multi-year periods of weak Weddell dense water formation, dense overflow transport in the Weddell Sea decreases, while the transport of cold water around the tip of the Antarctic Peninsula strengthens, driving a temperature decrease of 0.4C along the western Antarctic Peninsula. This mechanism implies that western Antarctic Peninsula coastal ocean temperature may cool in the future if Weddell Dense Shelf Water production slows down.

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Spatiotemporal variability of dissolved inorganic macronutrients along the northern Antarctic Peninsula (1996–2019)

Monteiro,

Henley,

Pollery

et al. 2023

Limnology & Oceanography

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The northern Antarctic Peninsula is a key region of the Southern Ocean due to its complex ocean dynamics, distinct water mass sources, and the climate‐driven changes taking place in the region. Despite the importance of macronutrients in supporting strong biological carbon uptake and storage, little is known about their spatiotemporal variability along the northern Antarctic Peninsula. Hence, we explored for the first time a 24‐year time series (1996–2019) in this region to understand the processes involved in the spatial and interannual variability of macronutrients. We found high macronutrient concentrations, even in surface waters and during strong phytoplankton blooms. Minimum concentrations of dissolved inorganic nitrogen (DIN; 16 μmol kg−1), phosphate (0.7 μmol kg−1), and silicic acid (40 μmol kg−1) in surface waters are higher than those recorded in surrounding regions. The main source of macronutrients is the intrusions of Circumpolar Deep Water and its modified variety, while local sources (organic matter remineralization, water mass mixing, and mesoscale structures) can enhance their spatiotemporal variability. However, we identified a depletion in silicic acid due to the influence of Dense Shelf Water from the Weddell Sea. Macronutrient concentrations show substantial interannual variability driven by the balance between the intrusions of modified Circumpolar Deep Water and advection of Dense Shelf Water, which is largely modulated by the Southern Annular Mode (SAM) and to some extent by El Niño‐Southern Oscillation (ENSO). These findings are critical to improving our understanding of the natural variability of this Southern Ocean ecosystem and how it is responding to climate changes.

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Long-term changes on the Bransfield Strait deep water masses: Variability, drivers and connections with the northwestern Weddell Sea

Cited by 13 publications

References 77 publications

Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Weddell Sea control of ocean temperature variability on the western Antarctic Peninsula

Spatiotemporal variability of dissolved inorganic macronutrients along the northern Antarctic Peninsula (1996–2019)

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Long-term changes on the Bransfield Strait deep water masses: Variability, drivers and connections with the northwestern Weddell Sea

Cited by 13 publications

References 77 publications

Drivers of Marine CO2‐Carbonate Chemistry in the Northern Antarctic Peninsula

Drivers of Marine CO2‐Carbonate Chemistry in the Northern Antarctic Peninsula

Weddell Sea control of ocean temperature variability on the western Antarctic Peninsula

Spatiotemporal variability of dissolved inorganic macronutrients along the northern Antarctic Peninsula (1996–2019)

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Product

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About

Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula

Drivers of Marine CO₂‐Carbonate Chemistry in the Northern Antarctic Peninsula